Amplified spontaneous emission on sodium D-lines using nonresonant optical pumping
T.D. Petukhov1,2, G.S. Evtushenko1,3, E.N. Tel'minov4
a:2:{s:4:"TYPE";s:4:"HTML";s:4:"TEXT";s:517:"1National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk, 634050, Russia
2Closed Joint-Stock Company Scientific Production Enterprize «Topaz» (AO NPP «Topaz»), 1, Academician Zuev square, Tomsk, 634055, Russia
3V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
4National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050,Russia";}
Keywords: активная оптическая система, усиленное спонтанное излучение, щелочные металлы, натрий, оптическая накачка, active optical system, amplified spontaneous emission, alkaline metals, sodium, optical pumping
Abstract
Experiments are described on the excitation of amplified spontaneous emission on the D-lines of sodium (D2 = 588.9 nm; D1 = 589.6 nm) at longitudinal optical pumping with a large detuning from the D2 line toward shorter wavelengths. The radiation spectra are measured, which proves gain on the both lines, at Na concentration of (1-5) ∙ 1014 cm-3, buffer gas (helium) pressure of 600 Torr at the working temperature, and pumping power density of more than 1.5 MW/cm2. The time characteristics show that the output radiation varies versus the concentration of sodium atoms in the active medium. The dependences of radiation absorption at the D-lines of sodium on the concentration of Na atoms and buffer gas pressure are given.
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